Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / scsi / scsi_transport_srp.c
blobcba1cf6a1c12dc720277b20e6ecafbc30a3e5677
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * SCSI RDMA (SRP) transport class
5 * Copyright (C) 2007 FUJITA Tomonori <tomof@acm.org>
6 */
7 #include <linux/init.h>
8 #include <linux/module.h>
9 #include <linux/jiffies.h>
10 #include <linux/err.h>
11 #include <linux/slab.h>
12 #include <linux/string.h>
14 #include <scsi/scsi.h>
15 #include <scsi/scsi_cmnd.h>
16 #include <scsi/scsi_device.h>
17 #include <scsi/scsi_host.h>
18 #include <scsi/scsi_transport.h>
19 #include <scsi/scsi_transport_srp.h>
20 #include "scsi_priv.h"
22 struct srp_host_attrs {
23 atomic_t next_port_id;
25 #define to_srp_host_attrs(host) ((struct srp_host_attrs *)(host)->shost_data)
27 #define SRP_HOST_ATTRS 0
28 #define SRP_RPORT_ATTRS 8
30 struct srp_internal {
31 struct scsi_transport_template t;
32 struct srp_function_template *f;
34 struct device_attribute *host_attrs[SRP_HOST_ATTRS + 1];
36 struct device_attribute *rport_attrs[SRP_RPORT_ATTRS + 1];
37 struct transport_container rport_attr_cont;
40 static int scsi_is_srp_rport(const struct device *dev);
42 #define to_srp_internal(tmpl) container_of(tmpl, struct srp_internal, t)
44 #define dev_to_rport(d) container_of(d, struct srp_rport, dev)
45 #define transport_class_to_srp_rport(dev) dev_to_rport((dev)->parent)
46 static inline struct Scsi_Host *rport_to_shost(struct srp_rport *r)
48 return dev_to_shost(r->dev.parent);
51 static int find_child_rport(struct device *dev, void *data)
53 struct device **child = data;
55 if (scsi_is_srp_rport(dev)) {
56 WARN_ON_ONCE(*child);
57 *child = dev;
59 return 0;
62 static inline struct srp_rport *shost_to_rport(struct Scsi_Host *shost)
64 struct device *child = NULL;
66 WARN_ON_ONCE(device_for_each_child(&shost->shost_gendev, &child,
67 find_child_rport) < 0);
68 return child ? dev_to_rport(child) : NULL;
71 /**
72 * srp_tmo_valid() - check timeout combination validity
73 * @reconnect_delay: Reconnect delay in seconds.
74 * @fast_io_fail_tmo: Fast I/O fail timeout in seconds.
75 * @dev_loss_tmo: Device loss timeout in seconds.
77 * The combination of the timeout parameters must be such that SCSI commands
78 * are finished in a reasonable time. Hence do not allow the fast I/O fail
79 * timeout to exceed SCSI_DEVICE_BLOCK_MAX_TIMEOUT nor allow dev_loss_tmo to
80 * exceed that limit if failing I/O fast has been disabled. Furthermore, these
81 * parameters must be such that multipath can detect failed paths timely.
82 * Hence do not allow all three parameters to be disabled simultaneously.
84 int srp_tmo_valid(int reconnect_delay, int fast_io_fail_tmo, long dev_loss_tmo)
86 if (reconnect_delay < 0 && fast_io_fail_tmo < 0 && dev_loss_tmo < 0)
87 return -EINVAL;
88 if (reconnect_delay == 0)
89 return -EINVAL;
90 if (fast_io_fail_tmo > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
91 return -EINVAL;
92 if (fast_io_fail_tmo < 0 &&
93 dev_loss_tmo > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
94 return -EINVAL;
95 if (dev_loss_tmo >= LONG_MAX / HZ)
96 return -EINVAL;
97 if (fast_io_fail_tmo >= 0 && dev_loss_tmo >= 0 &&
98 fast_io_fail_tmo >= dev_loss_tmo)
99 return -EINVAL;
100 return 0;
102 EXPORT_SYMBOL_GPL(srp_tmo_valid);
104 static int srp_host_setup(struct transport_container *tc, struct device *dev,
105 struct device *cdev)
107 struct Scsi_Host *shost = dev_to_shost(dev);
108 struct srp_host_attrs *srp_host = to_srp_host_attrs(shost);
110 atomic_set(&srp_host->next_port_id, 0);
111 return 0;
114 static DECLARE_TRANSPORT_CLASS(srp_host_class, "srp_host", srp_host_setup,
115 NULL, NULL);
117 static DECLARE_TRANSPORT_CLASS(srp_rport_class, "srp_remote_ports",
118 NULL, NULL, NULL);
120 static ssize_t
121 show_srp_rport_id(struct device *dev, struct device_attribute *attr,
122 char *buf)
124 struct srp_rport *rport = transport_class_to_srp_rport(dev);
125 return sprintf(buf, "%16phC\n", rport->port_id);
128 static DEVICE_ATTR(port_id, S_IRUGO, show_srp_rport_id, NULL);
130 static const struct {
131 u32 value;
132 char *name;
133 } srp_rport_role_names[] = {
134 {SRP_RPORT_ROLE_INITIATOR, "SRP Initiator"},
135 {SRP_RPORT_ROLE_TARGET, "SRP Target"},
138 static ssize_t
139 show_srp_rport_roles(struct device *dev, struct device_attribute *attr,
140 char *buf)
142 struct srp_rport *rport = transport_class_to_srp_rport(dev);
143 int i;
144 char *name = NULL;
146 for (i = 0; i < ARRAY_SIZE(srp_rport_role_names); i++)
147 if (srp_rport_role_names[i].value == rport->roles) {
148 name = srp_rport_role_names[i].name;
149 break;
151 return sprintf(buf, "%s\n", name ? : "unknown");
154 static DEVICE_ATTR(roles, S_IRUGO, show_srp_rport_roles, NULL);
156 static ssize_t store_srp_rport_delete(struct device *dev,
157 struct device_attribute *attr,
158 const char *buf, size_t count)
160 struct srp_rport *rport = transport_class_to_srp_rport(dev);
161 struct Scsi_Host *shost = dev_to_shost(dev);
162 struct srp_internal *i = to_srp_internal(shost->transportt);
164 if (i->f->rport_delete) {
165 i->f->rport_delete(rport);
166 return count;
167 } else {
168 return -ENOSYS;
172 static DEVICE_ATTR(delete, S_IWUSR, NULL, store_srp_rport_delete);
174 static ssize_t show_srp_rport_state(struct device *dev,
175 struct device_attribute *attr,
176 char *buf)
178 static const char *const state_name[] = {
179 [SRP_RPORT_RUNNING] = "running",
180 [SRP_RPORT_BLOCKED] = "blocked",
181 [SRP_RPORT_FAIL_FAST] = "fail-fast",
182 [SRP_RPORT_LOST] = "lost",
184 struct srp_rport *rport = transport_class_to_srp_rport(dev);
185 enum srp_rport_state state = rport->state;
187 return sprintf(buf, "%s\n",
188 (unsigned)state < ARRAY_SIZE(state_name) ?
189 state_name[state] : "???");
192 static DEVICE_ATTR(state, S_IRUGO, show_srp_rport_state, NULL);
194 static ssize_t srp_show_tmo(char *buf, int tmo)
196 return tmo >= 0 ? sprintf(buf, "%d\n", tmo) : sprintf(buf, "off\n");
199 int srp_parse_tmo(int *tmo, const char *buf)
201 int res = 0;
203 if (strncmp(buf, "off", 3) != 0)
204 res = kstrtoint(buf, 0, tmo);
205 else
206 *tmo = -1;
208 return res;
210 EXPORT_SYMBOL(srp_parse_tmo);
212 static ssize_t show_reconnect_delay(struct device *dev,
213 struct device_attribute *attr, char *buf)
215 struct srp_rport *rport = transport_class_to_srp_rport(dev);
217 return srp_show_tmo(buf, rport->reconnect_delay);
220 static ssize_t store_reconnect_delay(struct device *dev,
221 struct device_attribute *attr,
222 const char *buf, const size_t count)
224 struct srp_rport *rport = transport_class_to_srp_rport(dev);
225 int res, delay;
227 res = srp_parse_tmo(&delay, buf);
228 if (res)
229 goto out;
230 res = srp_tmo_valid(delay, rport->fast_io_fail_tmo,
231 rport->dev_loss_tmo);
232 if (res)
233 goto out;
235 if (rport->reconnect_delay <= 0 && delay > 0 &&
236 rport->state != SRP_RPORT_RUNNING) {
237 queue_delayed_work(system_long_wq, &rport->reconnect_work,
238 delay * HZ);
239 } else if (delay <= 0) {
240 cancel_delayed_work(&rport->reconnect_work);
242 rport->reconnect_delay = delay;
243 res = count;
245 out:
246 return res;
249 static DEVICE_ATTR(reconnect_delay, S_IRUGO | S_IWUSR, show_reconnect_delay,
250 store_reconnect_delay);
252 static ssize_t show_failed_reconnects(struct device *dev,
253 struct device_attribute *attr, char *buf)
255 struct srp_rport *rport = transport_class_to_srp_rport(dev);
257 return sprintf(buf, "%d\n", rport->failed_reconnects);
260 static DEVICE_ATTR(failed_reconnects, S_IRUGO, show_failed_reconnects, NULL);
262 static ssize_t show_srp_rport_fast_io_fail_tmo(struct device *dev,
263 struct device_attribute *attr,
264 char *buf)
266 struct srp_rport *rport = transport_class_to_srp_rport(dev);
268 return srp_show_tmo(buf, rport->fast_io_fail_tmo);
271 static ssize_t store_srp_rport_fast_io_fail_tmo(struct device *dev,
272 struct device_attribute *attr,
273 const char *buf, size_t count)
275 struct srp_rport *rport = transport_class_to_srp_rport(dev);
276 int res;
277 int fast_io_fail_tmo;
279 res = srp_parse_tmo(&fast_io_fail_tmo, buf);
280 if (res)
281 goto out;
282 res = srp_tmo_valid(rport->reconnect_delay, fast_io_fail_tmo,
283 rport->dev_loss_tmo);
284 if (res)
285 goto out;
286 rport->fast_io_fail_tmo = fast_io_fail_tmo;
287 res = count;
289 out:
290 return res;
293 static DEVICE_ATTR(fast_io_fail_tmo, S_IRUGO | S_IWUSR,
294 show_srp_rport_fast_io_fail_tmo,
295 store_srp_rport_fast_io_fail_tmo);
297 static ssize_t show_srp_rport_dev_loss_tmo(struct device *dev,
298 struct device_attribute *attr,
299 char *buf)
301 struct srp_rport *rport = transport_class_to_srp_rport(dev);
303 return srp_show_tmo(buf, rport->dev_loss_tmo);
306 static ssize_t store_srp_rport_dev_loss_tmo(struct device *dev,
307 struct device_attribute *attr,
308 const char *buf, size_t count)
310 struct srp_rport *rport = transport_class_to_srp_rport(dev);
311 int res;
312 int dev_loss_tmo;
314 res = srp_parse_tmo(&dev_loss_tmo, buf);
315 if (res)
316 goto out;
317 res = srp_tmo_valid(rport->reconnect_delay, rport->fast_io_fail_tmo,
318 dev_loss_tmo);
319 if (res)
320 goto out;
321 rport->dev_loss_tmo = dev_loss_tmo;
322 res = count;
324 out:
325 return res;
328 static DEVICE_ATTR(dev_loss_tmo, S_IRUGO | S_IWUSR,
329 show_srp_rport_dev_loss_tmo,
330 store_srp_rport_dev_loss_tmo);
332 static int srp_rport_set_state(struct srp_rport *rport,
333 enum srp_rport_state new_state)
335 enum srp_rport_state old_state = rport->state;
337 lockdep_assert_held(&rport->mutex);
339 switch (new_state) {
340 case SRP_RPORT_RUNNING:
341 switch (old_state) {
342 case SRP_RPORT_LOST:
343 goto invalid;
344 default:
345 break;
347 break;
348 case SRP_RPORT_BLOCKED:
349 switch (old_state) {
350 case SRP_RPORT_RUNNING:
351 break;
352 default:
353 goto invalid;
355 break;
356 case SRP_RPORT_FAIL_FAST:
357 switch (old_state) {
358 case SRP_RPORT_LOST:
359 goto invalid;
360 default:
361 break;
363 break;
364 case SRP_RPORT_LOST:
365 break;
367 rport->state = new_state;
368 return 0;
370 invalid:
371 return -EINVAL;
375 * srp_reconnect_work() - reconnect and schedule a new attempt if necessary
376 * @work: Work structure used for scheduling this operation.
378 static void srp_reconnect_work(struct work_struct *work)
380 struct srp_rport *rport = container_of(to_delayed_work(work),
381 struct srp_rport, reconnect_work);
382 struct Scsi_Host *shost = rport_to_shost(rport);
383 int delay, res;
385 res = srp_reconnect_rport(rport);
386 if (res != 0) {
387 shost_printk(KERN_ERR, shost,
388 "reconnect attempt %d failed (%d)\n",
389 ++rport->failed_reconnects, res);
390 delay = rport->reconnect_delay *
391 min(100, max(1, rport->failed_reconnects - 10));
392 if (delay > 0)
393 queue_delayed_work(system_long_wq,
394 &rport->reconnect_work, delay * HZ);
399 * scsi_target_block() must have been called before this function is
400 * called to guarantee that no .queuecommand() calls are in progress.
402 static void __rport_fail_io_fast(struct srp_rport *rport)
404 struct Scsi_Host *shost = rport_to_shost(rport);
405 struct srp_internal *i;
407 lockdep_assert_held(&rport->mutex);
409 if (srp_rport_set_state(rport, SRP_RPORT_FAIL_FAST))
410 return;
412 scsi_target_unblock(rport->dev.parent, SDEV_TRANSPORT_OFFLINE);
414 /* Involve the LLD if possible to terminate all I/O on the rport. */
415 i = to_srp_internal(shost->transportt);
416 if (i->f->terminate_rport_io)
417 i->f->terminate_rport_io(rport);
421 * rport_fast_io_fail_timedout() - fast I/O failure timeout handler
422 * @work: Work structure used for scheduling this operation.
424 static void rport_fast_io_fail_timedout(struct work_struct *work)
426 struct srp_rport *rport = container_of(to_delayed_work(work),
427 struct srp_rport, fast_io_fail_work);
428 struct Scsi_Host *shost = rport_to_shost(rport);
430 pr_info("fast_io_fail_tmo expired for SRP %s / %s.\n",
431 dev_name(&rport->dev), dev_name(&shost->shost_gendev));
433 mutex_lock(&rport->mutex);
434 if (rport->state == SRP_RPORT_BLOCKED)
435 __rport_fail_io_fast(rport);
436 mutex_unlock(&rport->mutex);
440 * rport_dev_loss_timedout() - device loss timeout handler
441 * @work: Work structure used for scheduling this operation.
443 static void rport_dev_loss_timedout(struct work_struct *work)
445 struct srp_rport *rport = container_of(to_delayed_work(work),
446 struct srp_rport, dev_loss_work);
447 struct Scsi_Host *shost = rport_to_shost(rport);
448 struct srp_internal *i = to_srp_internal(shost->transportt);
450 pr_info("dev_loss_tmo expired for SRP %s / %s.\n",
451 dev_name(&rport->dev), dev_name(&shost->shost_gendev));
453 mutex_lock(&rport->mutex);
454 WARN_ON(srp_rport_set_state(rport, SRP_RPORT_LOST) != 0);
455 scsi_target_unblock(rport->dev.parent, SDEV_TRANSPORT_OFFLINE);
456 mutex_unlock(&rport->mutex);
458 i->f->rport_delete(rport);
461 static void __srp_start_tl_fail_timers(struct srp_rport *rport)
463 struct Scsi_Host *shost = rport_to_shost(rport);
464 int delay, fast_io_fail_tmo, dev_loss_tmo;
466 lockdep_assert_held(&rport->mutex);
468 delay = rport->reconnect_delay;
469 fast_io_fail_tmo = rport->fast_io_fail_tmo;
470 dev_loss_tmo = rport->dev_loss_tmo;
471 pr_debug("%s current state: %d\n", dev_name(&shost->shost_gendev),
472 rport->state);
474 if (rport->state == SRP_RPORT_LOST)
475 return;
476 if (delay > 0)
477 queue_delayed_work(system_long_wq, &rport->reconnect_work,
478 1UL * delay * HZ);
479 if ((fast_io_fail_tmo >= 0 || dev_loss_tmo >= 0) &&
480 srp_rport_set_state(rport, SRP_RPORT_BLOCKED) == 0) {
481 pr_debug("%s new state: %d\n", dev_name(&shost->shost_gendev),
482 rport->state);
483 scsi_target_block(&shost->shost_gendev);
484 if (fast_io_fail_tmo >= 0)
485 queue_delayed_work(system_long_wq,
486 &rport->fast_io_fail_work,
487 1UL * fast_io_fail_tmo * HZ);
488 if (dev_loss_tmo >= 0)
489 queue_delayed_work(system_long_wq,
490 &rport->dev_loss_work,
491 1UL * dev_loss_tmo * HZ);
496 * srp_start_tl_fail_timers() - start the transport layer failure timers
497 * @rport: SRP target port.
499 * Start the transport layer fast I/O failure and device loss timers. Do not
500 * modify a timer that was already started.
502 void srp_start_tl_fail_timers(struct srp_rport *rport)
504 mutex_lock(&rport->mutex);
505 __srp_start_tl_fail_timers(rport);
506 mutex_unlock(&rport->mutex);
508 EXPORT_SYMBOL(srp_start_tl_fail_timers);
511 * srp_reconnect_rport() - reconnect to an SRP target port
512 * @rport: SRP target port.
514 * Blocks SCSI command queueing before invoking reconnect() such that
515 * queuecommand() won't be invoked concurrently with reconnect() from outside
516 * the SCSI EH. This is important since a reconnect() implementation may
517 * reallocate resources needed by queuecommand().
519 * Notes:
520 * - This function neither waits until outstanding requests have finished nor
521 * tries to abort these. It is the responsibility of the reconnect()
522 * function to finish outstanding commands before reconnecting to the target
523 * port.
524 * - It is the responsibility of the caller to ensure that the resources
525 * reallocated by the reconnect() function won't be used while this function
526 * is in progress. One possible strategy is to invoke this function from
527 * the context of the SCSI EH thread only. Another possible strategy is to
528 * lock the rport mutex inside each SCSI LLD callback that can be invoked by
529 * the SCSI EH (the scsi_host_template.eh_*() functions and also the
530 * scsi_host_template.queuecommand() function).
532 int srp_reconnect_rport(struct srp_rport *rport)
534 struct Scsi_Host *shost = rport_to_shost(rport);
535 struct srp_internal *i = to_srp_internal(shost->transportt);
536 struct scsi_device *sdev;
537 int res;
539 pr_debug("SCSI host %s\n", dev_name(&shost->shost_gendev));
541 res = mutex_lock_interruptible(&rport->mutex);
542 if (res)
543 goto out;
544 scsi_target_block(&shost->shost_gendev);
545 res = rport->state != SRP_RPORT_LOST ? i->f->reconnect(rport) : -ENODEV;
546 pr_debug("%s (state %d): transport.reconnect() returned %d\n",
547 dev_name(&shost->shost_gendev), rport->state, res);
548 if (res == 0) {
549 cancel_delayed_work(&rport->fast_io_fail_work);
550 cancel_delayed_work(&rport->dev_loss_work);
552 rport->failed_reconnects = 0;
553 srp_rport_set_state(rport, SRP_RPORT_RUNNING);
554 scsi_target_unblock(&shost->shost_gendev, SDEV_RUNNING);
556 * If the SCSI error handler has offlined one or more devices,
557 * invoking scsi_target_unblock() won't change the state of
558 * these devices into running so do that explicitly.
560 shost_for_each_device(sdev, shost) {
561 mutex_lock(&sdev->state_mutex);
562 if (sdev->sdev_state == SDEV_OFFLINE)
563 sdev->sdev_state = SDEV_RUNNING;
564 mutex_unlock(&sdev->state_mutex);
566 } else if (rport->state == SRP_RPORT_RUNNING) {
568 * srp_reconnect_rport() has been invoked with fast_io_fail
569 * and dev_loss off. Mark the port as failed and start the TL
570 * failure timers if these had not yet been started.
572 __rport_fail_io_fast(rport);
573 __srp_start_tl_fail_timers(rport);
574 } else if (rport->state != SRP_RPORT_BLOCKED) {
575 scsi_target_unblock(&shost->shost_gendev,
576 SDEV_TRANSPORT_OFFLINE);
578 mutex_unlock(&rport->mutex);
580 out:
581 return res;
583 EXPORT_SYMBOL(srp_reconnect_rport);
586 * srp_timed_out() - SRP transport intercept of the SCSI timeout EH
587 * @scmd: SCSI command.
589 * If a timeout occurs while an rport is in the blocked state, ask the SCSI
590 * EH to continue waiting (BLK_EH_RESET_TIMER). Otherwise let the SCSI core
591 * handle the timeout (BLK_EH_DONE).
593 * Note: This function is called from soft-IRQ context and with the request
594 * queue lock held.
596 enum blk_eh_timer_return srp_timed_out(struct scsi_cmnd *scmd)
598 struct scsi_device *sdev = scmd->device;
599 struct Scsi_Host *shost = sdev->host;
600 struct srp_internal *i = to_srp_internal(shost->transportt);
601 struct srp_rport *rport = shost_to_rport(shost);
603 pr_debug("timeout for sdev %s\n", dev_name(&sdev->sdev_gendev));
604 return rport && rport->fast_io_fail_tmo < 0 &&
605 rport->dev_loss_tmo < 0 &&
606 i->f->reset_timer_if_blocked && scsi_device_blocked(sdev) ?
607 BLK_EH_RESET_TIMER : BLK_EH_DONE;
609 EXPORT_SYMBOL(srp_timed_out);
611 static void srp_rport_release(struct device *dev)
613 struct srp_rport *rport = dev_to_rport(dev);
615 put_device(dev->parent);
616 kfree(rport);
619 static int scsi_is_srp_rport(const struct device *dev)
621 return dev->release == srp_rport_release;
624 static int srp_rport_match(struct attribute_container *cont,
625 struct device *dev)
627 struct Scsi_Host *shost;
628 struct srp_internal *i;
630 if (!scsi_is_srp_rport(dev))
631 return 0;
633 shost = dev_to_shost(dev->parent);
634 if (!shost->transportt)
635 return 0;
636 if (shost->transportt->host_attrs.ac.class != &srp_host_class.class)
637 return 0;
639 i = to_srp_internal(shost->transportt);
640 return &i->rport_attr_cont.ac == cont;
643 static int srp_host_match(struct attribute_container *cont, struct device *dev)
645 struct Scsi_Host *shost;
646 struct srp_internal *i;
648 if (!scsi_is_host_device(dev))
649 return 0;
651 shost = dev_to_shost(dev);
652 if (!shost->transportt)
653 return 0;
654 if (shost->transportt->host_attrs.ac.class != &srp_host_class.class)
655 return 0;
657 i = to_srp_internal(shost->transportt);
658 return &i->t.host_attrs.ac == cont;
662 * srp_rport_get() - increment rport reference count
663 * @rport: SRP target port.
665 void srp_rport_get(struct srp_rport *rport)
667 get_device(&rport->dev);
669 EXPORT_SYMBOL(srp_rport_get);
672 * srp_rport_put() - decrement rport reference count
673 * @rport: SRP target port.
675 void srp_rport_put(struct srp_rport *rport)
677 put_device(&rport->dev);
679 EXPORT_SYMBOL(srp_rport_put);
682 * srp_rport_add - add a SRP remote port to the device hierarchy
683 * @shost: scsi host the remote port is connected to.
684 * @ids: The port id for the remote port.
686 * Publishes a port to the rest of the system.
688 struct srp_rport *srp_rport_add(struct Scsi_Host *shost,
689 struct srp_rport_identifiers *ids)
691 struct srp_rport *rport;
692 struct device *parent = &shost->shost_gendev;
693 struct srp_internal *i = to_srp_internal(shost->transportt);
694 int id, ret;
696 rport = kzalloc(sizeof(*rport), GFP_KERNEL);
697 if (!rport)
698 return ERR_PTR(-ENOMEM);
700 mutex_init(&rport->mutex);
702 device_initialize(&rport->dev);
704 rport->dev.parent = get_device(parent);
705 rport->dev.release = srp_rport_release;
707 memcpy(rport->port_id, ids->port_id, sizeof(rport->port_id));
708 rport->roles = ids->roles;
710 if (i->f->reconnect)
711 rport->reconnect_delay = i->f->reconnect_delay ?
712 *i->f->reconnect_delay : 10;
713 INIT_DELAYED_WORK(&rport->reconnect_work, srp_reconnect_work);
714 rport->fast_io_fail_tmo = i->f->fast_io_fail_tmo ?
715 *i->f->fast_io_fail_tmo : 15;
716 rport->dev_loss_tmo = i->f->dev_loss_tmo ? *i->f->dev_loss_tmo : 60;
717 INIT_DELAYED_WORK(&rport->fast_io_fail_work,
718 rport_fast_io_fail_timedout);
719 INIT_DELAYED_WORK(&rport->dev_loss_work, rport_dev_loss_timedout);
721 id = atomic_inc_return(&to_srp_host_attrs(shost)->next_port_id);
722 dev_set_name(&rport->dev, "port-%d:%d", shost->host_no, id);
724 transport_setup_device(&rport->dev);
726 ret = device_add(&rport->dev);
727 if (ret) {
728 transport_destroy_device(&rport->dev);
729 put_device(&rport->dev);
730 return ERR_PTR(ret);
733 transport_add_device(&rport->dev);
734 transport_configure_device(&rport->dev);
736 return rport;
738 EXPORT_SYMBOL_GPL(srp_rport_add);
741 * srp_rport_del - remove a SRP remote port
742 * @rport: SRP remote port to remove
744 * Removes the specified SRP remote port.
746 void srp_rport_del(struct srp_rport *rport)
748 struct device *dev = &rport->dev;
750 transport_remove_device(dev);
751 device_del(dev);
752 transport_destroy_device(dev);
754 put_device(dev);
756 EXPORT_SYMBOL_GPL(srp_rport_del);
758 static int do_srp_rport_del(struct device *dev, void *data)
760 if (scsi_is_srp_rport(dev))
761 srp_rport_del(dev_to_rport(dev));
762 return 0;
766 * srp_remove_host - tear down a Scsi_Host's SRP data structures
767 * @shost: Scsi Host that is torn down
769 * Removes all SRP remote ports for a given Scsi_Host.
770 * Must be called just before scsi_remove_host for SRP HBAs.
772 void srp_remove_host(struct Scsi_Host *shost)
774 device_for_each_child(&shost->shost_gendev, NULL, do_srp_rport_del);
776 EXPORT_SYMBOL_GPL(srp_remove_host);
779 * srp_stop_rport_timers - stop the transport layer recovery timers
780 * @rport: SRP remote port for which to stop the timers.
782 * Must be called after srp_remove_host() and scsi_remove_host(). The caller
783 * must hold a reference on the rport (rport->dev) and on the SCSI host
784 * (rport->dev.parent).
786 void srp_stop_rport_timers(struct srp_rport *rport)
788 mutex_lock(&rport->mutex);
789 if (rport->state == SRP_RPORT_BLOCKED)
790 __rport_fail_io_fast(rport);
791 srp_rport_set_state(rport, SRP_RPORT_LOST);
792 mutex_unlock(&rport->mutex);
794 cancel_delayed_work_sync(&rport->reconnect_work);
795 cancel_delayed_work_sync(&rport->fast_io_fail_work);
796 cancel_delayed_work_sync(&rport->dev_loss_work);
798 EXPORT_SYMBOL_GPL(srp_stop_rport_timers);
801 * srp_attach_transport - instantiate SRP transport template
802 * @ft: SRP transport class function template
804 struct scsi_transport_template *
805 srp_attach_transport(struct srp_function_template *ft)
807 int count;
808 struct srp_internal *i;
810 i = kzalloc(sizeof(*i), GFP_KERNEL);
811 if (!i)
812 return NULL;
814 i->t.host_size = sizeof(struct srp_host_attrs);
815 i->t.host_attrs.ac.attrs = &i->host_attrs[0];
816 i->t.host_attrs.ac.class = &srp_host_class.class;
817 i->t.host_attrs.ac.match = srp_host_match;
818 i->host_attrs[0] = NULL;
819 transport_container_register(&i->t.host_attrs);
821 i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
822 i->rport_attr_cont.ac.class = &srp_rport_class.class;
823 i->rport_attr_cont.ac.match = srp_rport_match;
825 count = 0;
826 i->rport_attrs[count++] = &dev_attr_port_id;
827 i->rport_attrs[count++] = &dev_attr_roles;
828 if (ft->has_rport_state) {
829 i->rport_attrs[count++] = &dev_attr_state;
830 i->rport_attrs[count++] = &dev_attr_fast_io_fail_tmo;
831 i->rport_attrs[count++] = &dev_attr_dev_loss_tmo;
833 if (ft->reconnect) {
834 i->rport_attrs[count++] = &dev_attr_reconnect_delay;
835 i->rport_attrs[count++] = &dev_attr_failed_reconnects;
837 if (ft->rport_delete)
838 i->rport_attrs[count++] = &dev_attr_delete;
839 i->rport_attrs[count++] = NULL;
840 BUG_ON(count > ARRAY_SIZE(i->rport_attrs));
842 transport_container_register(&i->rport_attr_cont);
844 i->f = ft;
846 return &i->t;
848 EXPORT_SYMBOL_GPL(srp_attach_transport);
851 * srp_release_transport - release SRP transport template instance
852 * @t: transport template instance
854 void srp_release_transport(struct scsi_transport_template *t)
856 struct srp_internal *i = to_srp_internal(t);
858 transport_container_unregister(&i->t.host_attrs);
859 transport_container_unregister(&i->rport_attr_cont);
861 kfree(i);
863 EXPORT_SYMBOL_GPL(srp_release_transport);
865 static __init int srp_transport_init(void)
867 int ret;
869 ret = transport_class_register(&srp_host_class);
870 if (ret)
871 return ret;
872 ret = transport_class_register(&srp_rport_class);
873 if (ret)
874 goto unregister_host_class;
876 return 0;
877 unregister_host_class:
878 transport_class_unregister(&srp_host_class);
879 return ret;
882 static void __exit srp_transport_exit(void)
884 transport_class_unregister(&srp_host_class);
885 transport_class_unregister(&srp_rport_class);
888 MODULE_AUTHOR("FUJITA Tomonori");
889 MODULE_DESCRIPTION("SRP Transport Attributes");
890 MODULE_LICENSE("GPL");
892 module_init(srp_transport_init);
893 module_exit(srp_transport_exit);